8253939: [TESTBUG] Increase coverage of the cgroups detection code

[jmtd]

This is a backport of 8253939 to jdk8u-dev for cgroups v2 support.

It's not clean: several Files.writeString → Files.write(…,.getBytes()) changes needed.

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Progress

• Change must be properly reviewed (1 review required, with at least 1 Reviewer)
• Change must not contain extraneous whitespace
• Commit message must refer to an issue

Issue

• JDK-8253939: [TESTBUG] Increase coverage of the cgroups detection code

Reviewers

• Severin Gehwolf (@jerboaa - Reviewer)

Reviewing

Using git

Checkout this PR locally:
$ git fetch https://git.openjdk.org/jdk8u-dev pull/169/head:pull/169
$ git checkout pull/169

Update a local copy of the PR:
$ git checkout pull/169
$ git pull https://git.openjdk.org/jdk8u-dev pull/169/head

Using Skara CLI tools

Checkout this PR locally:
$ git pr checkout 169

View PR using the GUI difftool:
$ git pr show -t 169

Using diff file

Download this PR as a diff file:
https://git.openjdk.org/jdk8u-dev/pull/169.diff

[bridgekeeper]

👋 Welcome back jdowland! A progress list of the required criteria for merging this PR into pr/159 will be added to the body of your pull request. There are additional pull request commands available for use with this pull request.

[openjdk]

This backport pull request has now been updated with issue from the original commit.

[mlbridge]

Webrevs

• 02: Full (bed968bd)
• 01: Full - Incremental (72765b59)
• 00: Full (3640d59a)

[jerboaa]

Looks good.

[openjdk]

@jmtd Please do not rebase or force-push to an active PR as it invalidates existing review comments. All changes will be squashed into a single commit automatically when integrating. See OpenJDK Developers’ Guide for more information.

[openjdk]

@jmtd this pull request can not be integrated into pr/159 due to one or more merge conflicts. To resolve these merge conflicts and update this pull request you can run the following commands in the local repository for your personal fork:

git checkout 8253939-jdk8u-dev
git fetch https://git.openjdk.org/jdk8u-dev pr/159
git merge FETCH_HEAD
# resolve conflicts and follow the instructions given by git merge
git commit -m "Merge pr/159"
git push

[openjdk-notifier]

The parent pull request that this pull request depends on has now been integrated and the target branch of this pull request has been updated. This means that changes from the dependent pull request can start to show up as belonging to this pull request, which may be confusing for reviewers. To remedy this situation, simply merge the latest changes from the new target branch into this pull request by running commands similar to these in the local repository for your personal fork:

git checkout 8253939-jdk8u-dev
git fetch https://git.openjdk.org/jdk8u-dev master
git merge FETCH_HEAD
# if there are conflicts, follow the instructions given by git merge
git commit -m "Merge master"
git push

[openjdk]

@jmtd Please do not rebase or force-push to an active PR as it invalidates existing review comments. Note for future reference, the bots always squash all changes into a single commit automatically as part of the integration. See OpenJDK Developers’ Guide for more information.

[openjdk]

@jmtd This change now passes all automated pre-integration checks.

After integration, the commit message for the final commit will be:

8253939: [TESTBUG] Increase coverage of the cgroups detection code

Reviewed-by: sgehwolf

You can use pull request commands such as /summary, /contributor and /issue to adjust it as needed.

At the time when this comment was updated there had been no new commits pushed to the master branch. If another commit should be pushed before you perform the /integrate command, your PR will be automatically rebased. If you prefer to avoid any potential automatic rebasing, please check the documentation for the /integrate command for further details.

➡️ To integrate this PR with the above commit message to the master branch, type /integrate in a new comment.

[jerboaa]

Looks good. I've approved the bug. Feel free to integrate. Please rebase #185 after. Thanks!

[jerboaa]

Tier 1 GHA test failure on x86 of gc/6581734/Test6581734.java seems unrelated.

[jmtd]

/integrate

[openjdk]

Going to push as commit 4dfc742.

[openjdk]

@jmtd Pushed as commit 4dfc742.

💡 You may see a message that your pull request was closed with unmerged commits. This can be safely ignored.